孔洞分布形式对部分PCM填充轻质墙体的传热影响  

Effect of hole distribution form on heat transfer of partially PCM filled light weight wall

作　　者：孟凡康 岳扬皓 MENG Fankang;YUE Yanghao(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《热科学与技术》2024年第3期241-248,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51774167);辽宁省自然科学基金指导计划资助项目(2019-ZD-0044);2022年辽宁省教育厅基本科研资助项目(面上项目)(LJKMZ20220701);辽宁工程技术大学学科创新团队资助项目(LNTU20TD-21)。

摘　　要：为了优化孔洞分布形式,提高部分填充相变材料(phase change materials, PCM)轻质墙体的传热性能,在相同的孔洞率条件下,以4种孔洞分布形式部分PCM填充的多孔砖为研究对象,构建自然对流与相变导热耦合传热模型,采用数值模拟方法分析讨论了周期性边界条件下不同孔洞分布形式对墙体内外壁面温度、热流密度、融化液相分数等参数的影响。获得具体结论:4种形式的墙体均具有消减室外温度振幅和延迟作用;随着孔洞分散程度的减小,内外表面平均温度振幅、平均温度延迟及内表面平均热流密度振幅越大,内外表面平均热流密度、外表面平均热流密度振幅及PCM液相分数越小;相比其他形式,孔洞分散程度最小的case 2形式,内表面平均温度下降0.14~0.50 K,内表面平均热流密度下降1.24~4.29 W/m^(2),PCM平均液相分数下降0.024~0.114,具有更好的传热性能;靠近室外侧孔洞内空气的流动方向随时间发生变化,而靠近室内侧保持不变;部分PCM填充轻质墙体几何结构优化设计应考虑孔洞的分布形式对传热性能的影响。It aims to optimize the holes distribution form to improve the heat transfer performance of light weight walls partially filled with phase-change material(PCM). Focusing on four holes distribution forms in perforated brick partially filled with PCM under the same porosity, a coupled heat transfer model of natural convection and phase change heat con-duction is established. The effects of these forms on the internal and external wall surface temperature, heat flux density and molten liquid fraction were analyzed using numerical simulation under periodic boundary conditions.The results reveal that the four types of walls can reduce the outdoor temperature amplitude and delay its transfer. Decreasing hole dispersionenhances the average temperature amplitude and delay on both internal and external surfaces, as well as the average heat flux amplitude of internal surface, while reducing the average heat flux of the internal and external surfaces, the average heat flux amplitude of the external surface and the PCM liquid fraction. Particularly, the Case2 configuration, with the smallest degree of pore dispersion, exhibits superior heat transfer performance, showing a decrease in the average temperature of the inner surface by 0.14-0.50 K, the average heat flux density on the inner surface by 1.24-4.29 W/m^(2), and the average liquid fraction of PCM by 0.024-0.114. The airflow di-rection in the hole near outdoor changes with time, while the right side remains unchanged. The distribution of holes should be considered in the optimal design of the geometric structure of the new light weight wall.

关 键 词：轻质墙体 相变材料 孔洞 分布形式 传热特性 

分 类 号：TU111.48[建筑科学—建筑理论]